When I first started at the bank as a teller, we were running 9600 bps
multidrop lines. but, luckily for me, I was blissfully unaware of
anything related to networking at the time, so I didn't notice. ;-)
By the time I started in the department we had upgraded to 56k frame
relay with Motorola FRADs. We subsequently got rid of the FRADs and
have upgraded everyone to full or fractional DS1. And we've added a
*lot* of new toys for me to play with. heh heh....
John
>>On most serial links, you are running full duplex with only two
>>devices. This makes it impossible to have collisions. They just
don't
>>apply in this situation. Heck, even in situations where you can run
>>half-duplex serial I don't know what happens when both stations
transmit
>>at the same time. I've never personally experienced a half-duplex
>>serial link, I've just heard that they exist.
>Count this lack of experience among your blessings...especially if
>your lack of experience was with 2000 or 2400 bps multidrop.
>
>Polled multidrop is very much like token ring, except where the token
>control is distributed in the LAN, it is centralized in the mainframe
>or front end processor (although Cisco routers can poll).
>Unfortunately, there was much more of a chance that an individual
>modem or host would decide to transmit when it wasn't being polled,
>or would fail to "release the token."
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=17072&t=17050
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